Kim Kardashian, Kendall and Kylie Jenner Dance, Sing Along to Sam Smith's "Stay With Me" at 2014 MTV VMAs: See the GIF

Kim Kardashian and half-sisters Kendall and Kylie Jenner were spotted swaying and singing along to Sam Smith's performance of "Stay With Me" at the 2014 MTV VMAsCredit: Kevin Mazur/MTV1415/WireImage

Count the Kardashian-Jenner sisters among Sam Smith's many fans. During the "I'm Not the Only One" crooner's performance of "Stay With Me" at the 2014 MTV VMAs on Sunday, Aug. 24, Kim Kardashian and half-sisters Kendall and Kylie Jenner were spotted swaying and singing along to the music.

Kardashian, 33, actually introduced Smith's performance before rejoining her siblings in the audience. Taking the stage in a plunging minidress, the reality star casually referred to the British singer as her "friend."

Smith, 22, proceeded to bring down the house with a soulful, stripped-down rendition of his VMAs-nominated hit song while wearing a sharp Calvin Klein Collection suit. The crowd — including the Kardashian-Jenner girls — watched rapt with attention, mouthing the words and dancing in their seats.

Kanye West's wife first met Smith at Jimmy Kimmel's late-night show on Aug. 4. The singer Instagrammed a picture of them backstage at the time, praising the reality star as "outrageously beautiful." He later told Capital FM that she smelled of vanilla and was "really sweet" to him.